<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 提示区 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tabs标签页 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs tab-position="left" v-model="activeIndex" :before-leave='beforeTableLeave' @tab-click='tabClick'>
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight" type="number">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number" type="number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="props"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
              <!-- 渲染表单的item项 -->
              <el-form-item :label="item.attr_name" v-for='(item) in manyTableData' :key='item.attr_id'>
                  <el-checkbox-group v-model="item.attr_vals" >
                      <el-checkbox :label="item1" v-for="(item1,i) in item.attr_vals" :key="i" border></el-checkbox>
                  </el-checkbox-group>
              </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
              <el-form-item :label='item.attr_name' v-for='(item) in onlyTableData' :key='item.attr_id'>
                  <el-input v-model='item.attr_vals'></el-input>
              </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
              <!--
                   action: 表示图片上传的api接口地址 
              -->
              <el-upload :action="uploadUrl" :headers='headerObj' :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :on-success='uploadSuccess' multiple>
                <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
              <!-- 富文本编辑器组件 -->
              <quill-editor v-model='addForm.goods_introduce'></quill-editor>
              <el-button type="primary" class="addGood" @click="addGood">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
      <!-- 图片预览的对话框 -->
      <el-dialog
        title="图片预览"
        :visible.sync="previewDialogVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
    </el-card>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data() {
    return {
        // 上传图片的url地址
        uploadUrl:'http://127.0.0.1:8888/api/private/v1/upload',
        // 图片上传组件的请求头对象
        headerObj:{
            Authorization:window.sessionStorage.getItem('token')
        },
      activeIndex: "0",
      //   添加商品的表单数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        // 图片的数组
        pics:[],
        // 商品的详情描述
        goods_introduce:'',
        attrs:[]
      },
      //   添加商品的表单数据对象的验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" }
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" }
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" }
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" }
        ],
        goods_cat: [
          { required: true, message: "请输入商品分类", trigger: "blur" }
        ],
      },
      // 商品分类数据
      cateList: [],
      //   级联选择器的配置对象
      props: {
        expandTrigger: "hover",
        label: "cat_name",
        value: "cat_id",
        children: "children"
      },
    //   动态参数列表数据
      manyTableData:[],
      // 静态属性列表数据
      onlyTableData:[],
    //   图片预览的路径地址
      previewPath:'',
    //   控制图片预览对话框的显示与隐藏
      previewDialogVisible:false
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //   获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类失败！");
      this.cateList = res.data;
        // console.log(this.cateList);
    },
    // 级联选择器选中项变化时，触发的函数
    handleChange() {
        if(this.addForm.goods_cat.length!==3){
            this.addForm.goods_cat=[]
        }
    },
    beforeTableLeave(activeName,oldActiveName){
        // console.log('即将离开的标签页名字是'+oldActiveName)
        // console.log('即将进入的标签页名字是'+activeName)
        if(oldActiveName == 0 && this.addForm.goods_cat.length !== 3){
            this.$message.error('请先选择商品分类！')
            return false
        }
    },
    // tab切换时，触发这个函数
    async tabClick(){
        // console.log(this.activeIndex)
        // 证明你访问的是动态参数面板
        if(this.activeIndex==="1"){
         const {data:res} =await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
         if(res.meta.status!==200) return this.$message.error('获取动态参数列表失败！')
            res.data.forEach(item=>{
               item.attr_vals = item.attr_vals.length===0 ? []: item.attr_vals.split(',')
            })
            console.log(res.data)
            this.manyTableData=res.data
        }
        // 证明你访问的是静态属性面板
        if(this.activeIndex==='2'){
            const {data:res} =await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
         if(res.meta.status!==200) return this.$message.error('获取静态属性列表失败！')
            this.onlyTableData=res.data
        }
        
    },
    // 处理图片预览事件
    handlePreview(file){
        this.previewPath=file.response.data.url
        this.previewDialogVisible=true
    },
    // 处理图片移除的事件
    handleRemove(file){
        // console.log(file)
        // 1.获取将要删除的图片的临时路径
        const filePath=file.response.data.tem_path
        // 2.从pics数组中，找到这张图片的索引值
        const i = this.addForm.pics.findIndex((x)=>{
            x.pic===filePath
        })
        // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
        this.addForm.pics.splice(i,1)
        // console.log(this.addForm)
    },
    //监听图片上传成功的事件
    uploadSuccess(response){
        // 1.拼接得到一个图片信息对象
        const picInfo={pic:response.data.tmp_path}
        // 2.将图片信息对象，push到pics数组中
        this.addForm.pics.push(picInfo)
        // console.log(this.addForm)
        
    },
    // 添加商品
    addGood(){
        this.$refs.addFormRef.validate(async valid=>{
            if(!valid)return this.$message.error('请填写必要的表单项！')
            // 执行添加商品的业务逻辑
            // 发送请求前：需对提交的表单进行处理goods_cat attrs
            // 处理动态参数
              this.manyTableData.forEach(item=>{
                const newInfo={
                  attr_id:item.attr_id,
                  attr_value:item.attr_vals.join(',')
                }
                this.addForm.attrs.push(newInfo)
              })
              // 处理静态属性
              this.onlyTableData.forEach(item=>{
                const newInfo={
                   attr_id:item.attr_id,
                  attr_value:item.attr_vals
                }
                this.addForm.attrs.push(newInfo)
              })
           // this.addForm.goods_cat = this.addForm.goods_cat.join(',')
            // 以上写法不对：级联选择器绑定的对象goods_cat要求是数组对象
            // 解决办法: 包：lodash 方法（深拷贝）：cloneDeep(boj)
            // 将this.addForm进行深拷贝
              const form = _.cloneDeep(this.addForm)
              form.goods_cat = form.goods_cat.join(',')
              // console.log(form)
              // 发起请求添加商品
              const {data:res} = await this.$http.post('goods',form)
              if(res.meta.status!==201)return this.$message.error(res.meta.msg)
              this.$message.success('添加商品成功！')
              // 跳转到商品列表
              this.$router.push('/goods')
        })
    }
  },
  computed:{
    
      cateId(){
          if(this.addForm.goods_cat.length===3){
              return this.addForm.goods_cat[2]
          }
          return null
      }
  }
};
</script>
<style lang="less" scoped>
.previewImg{
    width: 100%;
}
.addGood{
    margin-top: 15px;
}
</style>